Access data from QSqlTableModel

[qlands]

Hi,

I am very raw with model/view hence the many questions..

On my QSqlTableModel I have the following code to present the data:

QVariant maintModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::DisplayRole)
    {
        QString var;
        var = record(index.row()).value("cnty_nam").toString();
        qDebug() << index.row() << displayColumnCode << var;
        return var;
    }
    return QVariant();
}

QVariant maintModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::DisplayRole)
    {
        QString var;
        var = record(index.row()).value("cnty_nam").toString();
        qDebug() << index.row() << displayColumnCode << var;
        return var;
    }
    return QVariant();
}

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I am just displaying one column thus I just use row. From the debug I can see that the row numbers are fine, also the column exists, but in this case var is always empty! because record(index.row()).value("cnty_nam").isValid() is always false!!!

I initialize the model with:

m_mainmodel = new maintModel(this,db);
    m_mainmodel->setTable("country");
    m_mainmodel->setEditStrategy(QSqlTableModel::OnManualSubmit);
    if (m_mainmodel->select())
    {
        ui->ListView1->setModel(m_mainmodel);
    }

m_mainmodel = new maintModel(this,db);
    m_mainmodel->setTable("country");
    m_mainmodel->setEditStrategy(QSqlTableModel::OnManualSubmit);
    if (m_mainmodel->select())
    {
        ui->ListView1->setModel(m_mainmodel);
    }

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For sure is something very silly... but I don't know what is happening!!!

Thanks,
Carlos.

[mcosta]

One question:

"Why are you re-implementing this function?"

You can use QSqlTableModel as it is.

[qlands]

Well I have more than the display role. For example I need to display a different pixmap based on some extra data attached to every record (that is not stored in the database). I use this under Qt:ecorationRole. That's why i am reimplementing this.

[mcosta]

Ok,

I suggest you to call the parent implementation when you have to fetch data and add your code only to get information specific to your implementation.

QVariant maintModel::data(const QModelIndex &index, int role) const
{
    QVariant result;
    if (role == Qt::DecorationRole) {
        // Your code
    }
    else
        result = QSqlTableModel::data(index, role);
 
    return result;
}

QVariant maintModel::data(const QModelIndex &index, int role) const
{
    QVariant result;
    if (role == Qt::DecorationRole) {
        // Your code
    }
    else
        result = QSqlTableModel::data(index, role);

    return result;
}

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[qlands]

Yep!!!.

Many thanks,
Carlos